Drinking mug



FIG. 1 is a perspective view of a drinking mug showing my new design.

FIG. 2 is a front elevational view thereof, the rear and sideelevational views being an identical image thereof.

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a drinking mug, as shown and described.